J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (3): 265-270.DOI: 10.1016/j.jmst.2015.11.010

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M5B3 Boride at the Grain Boundary of a Nickel-based Superalloy

Beining Du1, 2, 3, Zhiwu Shi1, Jinxia Yang1, Zhaokuang Chu1, Chuanyong Cui1, Xiaofeng Sun1, Liyuan Sheng2, 3, Yufeng Zheng2, 3   

  1. 1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    2 Peking University, Beijing 100871, China;
    3 PKU-HKUST ShenZhen-Hong Kong Institution, Shenzhen 518057, China
  • 收稿日期:2015-01-19 修回日期:2015-03-19 出版日期:2016-03-10

M5B3 Boride at the Grain Boundary of a Nickel-based Superalloy

Beining Du1, 2, 3, Zhiwu Shi1, Jinxia Yang1, Zhaokuang Chu1, Chuanyong Cui1, Xiaofeng Sun1, Liyuan Sheng2, 3, Yufeng Zheng2, 3   

  1. 1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    2 Peking University, Beijing 100871, China;
    3 PKU-HKUST ShenZhen-Hong Kong Institution, Shenzhen 518057, China
  • Received:2015-01-19 Revised:2015-03-19 Online:2016-03-10
  • Contact: Prof.; Tel.: +86 24 83978292; Fax: +86 24 23971758.E-mail address: chycui@imr.ac.cn (C. Cui).
  • Supported by:
    This work was partly supported by the High Technology Research and Development Program of China (No. 2014AA041701), the National Natural Science Foundation of China (Nos. 51171179, 51271174, 51331005, and 11332010), and China Postdoctoral Science Foundation under Grant No. 2015M580923.

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摘要： The grain boundary microstructures of a heat-treated Ni-based cast superalloy IN792 were investigated. The results show that M5B3 boride precipitates at the grain boundary. A special orientation relationship between M5B3 phase and the matrix at one side of the grain boundary is found. At the same time, two M5B3 borides with different orientations could co-exist in a single M5B3 particle as an intergrowth besides existing alone, thus forming orientation relationship between the two M5B3 phases and matrix. This phenomenon could be attributed to the special orientation relationship between M5B3 phase and the matrix.

关键词: Nickel superalloy, Grain boundaries, Boride, Crystal structure, Intergrowth, Orientation relationship

Abstract: The grain boundary microstructures of a heat-treated Ni-based cast superalloy IN792 were investigated. The results show that M5B3 boride precipitates at the grain boundary. A special orientation relationship between M5B3 phase and the matrix at one side of the grain boundary is found. At the same time, two M5B3 borides with different orientations could co-exist in a single M5B3 particle as an intergrowth besides existing alone, thus forming orientation relationship between the two M5B3 phases and matrix. This phenomenon could be attributed to the special orientation relationship between M5B3 phase and the matrix.

Key words: Nickel superalloy, Grain boundaries, Boride, Crystal structure, Intergrowth, Orientation relationship